tipc: Resetting bearer tipc: Disabling bearer ================================================================== BUG: KCSAN: data-race in _prb_read_valid / data_alloc write to 0xffffffff86c6a240 of 8 bytes by task 27219 on cpu 0: data_alloc+0x310/0x390 kernel/printk/printk_ringbuffer.c:1129 prb_reserve+0x8d7/0xae0 kernel/printk/printk_ringbuffer.c:1724 vprintk_store+0x54a/0x910 kernel/printk/printk.c:2354 vprintk_emit+0x1a4/0x600 kernel/printk/printk.c:2455 vprintk_default+0x26/0x30 kernel/printk/printk.c:2494 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82 _printk+0x79/0xa0 kernel/printk/printk.c:2504 fserror_report+0x3bb/0x500 fs/fserror.c:178 fserror_report_file_metadata include/linux/fserror.h:61 [inline] __ext4_error_inode+0x185/0x3f0 fs/ext4/super.c:861 check_xattrs+0x530/0x7f0 fs/ext4/xattr.c:298 __xattr_check_inode+0x3c/0x50 fs/ext4/xattr.c:319 ext4_iget_extra_inode+0xfb/0x1f0 fs/ext4/inode.c:5024 __ext4_iget+0x15b5/0x2350 fs/ext4/inode.c:5339 ext4_orphan_get+0x152/0x430 fs/ext4/ialloc.c:1391 ext4_orphan_cleanup+0x5fa/0xa00 fs/ext4/orphan.c:465 __ext4_fill_super fs/ext4/super.c:5668 [inline] ext4_fill_super+0x3408/0x37c0 fs/ext4/super.c:5791 get_tree_bdev_flags+0x291/0x300 fs/super.c:1694 get_tree_bdev+0x1f/0x30 fs/super.c:1717 ext4_get_tree+0x1c/0x30 fs/ext4/super.c:5823 vfs_get_tree+0x57/0x1d0 fs/super.c:1754 fc_mount fs/namespace.c:1193 [inline] do_new_mount_fc fs/namespace.c:3763 [inline] do_new_mount+0x288/0x8d0 fs/namespace.c:3839 path_mount+0x4d0/0xbc0 fs/namespace.c:4159 do_mount fs/namespace.c:4172 [inline] __do_sys_mount fs/namespace.c:4361 [inline] __se_sys_mount+0x28c/0x2e0 fs/namespace.c:4338 __x64_sys_mount+0x67/0x80 fs/namespace.c:4338 x64_sys_call+0x2d61/0x3020 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffffffff86c6a240 of 16 bytes by task 27216 on cpu 1: desc_read kernel/printk/printk_ringbuffer.c:496 [inline] desc_read_finalized_seq kernel/printk/printk_ringbuffer.c:1931 [inline] prb_read kernel/printk/printk_ringbuffer.c:1979 [inline] _prb_read_valid+0x1bc/0x950 kernel/printk/printk_ringbuffer.c:2170 desc_update_last_finalized+0x8f/0x170 kernel/printk/printk_ringbuffer.c:1570 prb_final_commit+0x10d/0x150 kernel/printk/printk_ringbuffer.c:1839 vprintk_store+0x88b/0x910 kernel/printk/printk.c:2381 vprintk_emit+0x1a4/0x600 kernel/printk/printk.c:2455 vprintk_default+0x26/0x30 kernel/printk/printk.c:2494 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82 _printk+0x79/0xa0 kernel/printk/printk.c:2504 bearer_disable+0x78/0x190 net/tipc/bearer.c:412 tipc_l2_device_event+0x1cb/0x320 net/tipc/bearer.c:-1 notifier_call_chain kernel/notifier.c:85 [inline] raw_notifier_call_chain+0x83/0x1c0 kernel/notifier.c:453 call_netdevice_notifiers_info net/core/dev.c:2249 [inline] call_netdevice_notifiers_extack net/core/dev.c:2287 [inline] call_netdevice_notifiers net/core/dev.c:2301 [inline] unregister_netdevice_many_notify+0xedb/0x1710 net/core/dev.c:12414 unregister_netdevice_many net/core/dev.c:12477 [inline] unregister_netdevice_queue+0x1cd/0x200 net/core/dev.c:12291 unregister_netdevice include/linux/netdevice.h:3408 [inline] __tun_detach+0x82c/0xb30 drivers/net/tun.c:621 tun_detach drivers/net/tun.c:637 [inline] tun_chr_close+0x5a/0x100 drivers/net/tun.c:3436 __fput+0x29b/0x650 fs/file_table.c:469 ____fput+0x1c/0x30 fs/file_table.c:497 task_work_run+0x130/0x1a0 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:67 [inline] exit_to_user_mode_loop+0x1f4/0x6f0 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline] do_syscall_64+0x249/0x370 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 27216 Comm: syz.8.17063 Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 ==================================================================